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grendel
sage
Reged: 04/12/09
Posts: 243
Loc: Canterbury, Kent, UK
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OK so I have been asked to post my how to on this item.
I made this a while back now, and it has since been adapted for a different focuser. anyway I had the remains of some electric screwdriver gearboxes, a while before I had made a drive system from 6 of these to get the right number of 1:7 reduction ratios. Anyway I had one section left so this was what I determined to use. On my skyatcher scope I took the silver endcap off the focus know, and found I could pack out the output shaft to make a tight fit into the focuser knob, my latest version I ground down the focus shaft to a hex to fit into the screwdriver socket.
Fitting the end cap on the gearbox so I could turn it was tricky, in the end I stripped one of the motors down and instead of the end cap, push fitted a spare gear from an old printer I had available, this gave me my knorled input.
Some insulating tape round the whole lot held it together and to stop the gearbox body turning a bracket was fashioned to hold the gearbox fixed in place in relation to the scope.
Grendel
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grendel
sage
Reged: 04/12/09
Posts: 243
Loc: Canterbury, Kent, UK
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components:-
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grendel
sage
Reged: 04/12/09
Posts: 243
Loc: Canterbury, Kent, UK
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installed focuser
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grendel
sage
Reged: 04/12/09
Posts: 243
Loc: Canterbury, Kent, UK
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exploded view of gearbox
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grendel
sage
Reged: 04/12/09
Posts: 243
Loc: Canterbury, Kent, UK
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the finished article
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grendel
sage
Reged: 04/12/09
Posts: 243
Loc: Canterbury, Kent, UK
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finally how it looks today on a different focuser
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Don W
Postmaster
Reged: 05/19/03
Posts: 14621
Loc: Wisconsin, USA
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Very nice, but can it drive screws too?
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Don Wyman
Obsession 18" f/4.5 #1166
W/Argo Navis DSC and Torus Primary
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grendel
sage
Reged: 04/12/09
Posts: 243
Loc: Canterbury, Kent, UK
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not any more
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Happy-Idiot
Carpal Tunnel
Reged: 04/06/06
Posts: 2818
Loc: 3rd Rock
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Peter i think that is one of the neatest ATM's.  I am on the hunt for parts.
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Brian
A small scope that gets used often is a better investment than a big scope that stays in the closet.
Unitrons, you spend more time looking at them than you do through them.
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